gwd3-4

Q4:

In the year following an eight-cent increase in the federal tax on a pack of cigarettes, sales of cigarettes fell ten percent.  In contrast, in the year prior to the tax increase, sales had fallen one percent.  The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes.

The argument above requires which of following assumptions?

1. During the year following the tax increase, the pretax price of a pack of cigarettes did not increase by as much as it had during the year prior to the tax increase.
2. The one percent fall in cigarette sales in the year prior to tax increase was due to a smaller tax increase.
3. The pretax price of a pack of cigarettes gradually decreased throughout the year before and the year after the tax increase.
4. For the year following the tax increase, the pretax price of a pack of cigarettes was not eight or more cents lower than it had been the previous year.
5. As the after-tax price of a pack of cigarettes rises, the pretax price also rises.   Answer: d

不是很明白，这个pretax price 和 after-tax Price 有什么关系，逻辑太弱了，帮帮我吧~~~~

简单的例子,你在香港买香水会比在国内便宜很多,为啥? 国内上了税而香港是免税港口

同样一瓶香水,香港卖299(pretax price)

             北京卖599(after-tax price)

after-tax price=pretax price + tax

就此道题目而言，在香烟课了８分的税后，销量下降１０％，在没有上税之前只下降了１％，由此推出上税和销售密切相关，询问ASSUMPTION是什么

Ｄ．For the year following the tax increase, the pretax price of a pack of cigarettes was not eight or more cents lower than it had been the previous year.

取非得：多手税的一年，香烟没加税前的价格就下降了８分，这样一来即便加了８分的税，after-tax price仍然是不变的，如果价格不变销售下降１０％推出导致下降可能另有他因．对原文章削弱

典型的NOT+WEAKEN结构

我也是逻辑菜鸟，还请牛人多多指教啊

谢谢2楼，我想这道题目我是懂了~~~

我看完题目，就觉得正确的assumption选项一定是证明香烟的销量仅跟after-tax price有关（排它因），理解能力不够好，看了半天也看不出哪个选项是在排它因~~~无语。。。